[I]

1. IDENTLEN
2. IDSET
3. IGNORE_CASE
4. INCLUDE
5. INCLUDES
6. INCREFS
7. INCS
8. INHIBIT_STRING_HEADER
9. INITIAL
10. INITIALSIZE
11. INITIAL_BUFSIZE
12. INIT_BUF_SIZE
13. INIT_COMPILE_STACK_SIZE
14. INIT_FAILURE_ALLOC
15. INIT_FAIL_STACK
16. INSERT_JUMP
17. INSERT_JUMP2
18. INT16_MAX
19. INT16_MIN
20. INT32_MAX
21. INT32_MIN
22. INT8_MAX
23. INT8_MIN
24. INTERVAL
25. INVNAME
26. INVNAME2
27. INVPOST
28. INVPOST2
29. ISALNUM
30. ISALPHA
31. ISASCII
32. ISBLANK
33. ISCNTRL
34. ISDIGIT
35. ISGRAPH
36. ISLOWER
37. ISPRINT
38. ISPUNCT
39. ISSPACE
40. ISUPPER
41. ISXDIGIT
42. IS_ACTIVE
43. IS_CHAR_CLASS
44. IS_CV_QUALIFIER
45. IS_EMPTY
46. IS_RESERVED_SHARP
47. IS_RESERVED_VARIABLE
48. IS_RESERVED_WORD
49. IS_RESERVED_YACC
50. IS_TYPE_QUALIFIER